Q 99: Is there an option to appy a fear effect when dealing damage that isn't based purely on a charge? The idea is Never Outnumbered + Imperious Command shtick and then spank everyone within 40' (sweeping strike as a Powerful Build Large creature with a spiked chain) to keep them cowering until they're all dead.
This only gets you 20 feet of reach.
Powerful Build does nothing for you to increase reach. Your reach is determined from YOUR size, not your weapon's size. Reach weapons only double your reach. It doesn't matter if you somehow were wielding a colossal sized spiked chain and were a large sized creature. You would still only get 10 feet of base reach, doubled for using a reach weapon.
Sweeping Strike does nothing for you to increase the maximum distance between you and your threatened squares, "practical reach" so to speak. Your new adjacent square must be one you already threaten.
I would suggest picking up some of the following:
Aberration Blood + Inhuman Reach (Both Lords of Madness, feats) = +5 feet reach
Warshaper 3 (Complete Warrior, class) = +5 feet reach
Willing Deformity + Deformity (Tall) (Both Heroes of Horror, feats) = +5 feet reach (Requires medium size, but I don't think any group or DM will give three shits, so house rule)
Permanency Enlarge Person from NPC spellcaster (Both PHB, spells)= 2990 gp (2500 + 450 + 90) = +5 feet reach (Requires humanoid type)
Dancing Blade Form (Tome of Battle, Stance, Iron Heart 5): +5 feet reach during your turn
Extended Reach (Savage Species, feat): +5 feet reach to nonrigid attack form